210thars thanks! The Czech site is good, have seen it earlier, language is not much easier than Polish...
Also :
RSBN-4N,
PRMG-4KM, "Morse lanterns"
KNS-1 &
KNS-4,
APM-90M lamp,
SOV MRM-48 "Marker",
some terminology!
Marker E-615, Marker MRM-48 and others are part of certain type of PRMG, just like ”western” Markers are of our ILS.